http://en.wikipedia.org/wiki/Diesel_engine
http://en.wikipedia.org/wiki/Gasoline_engine

Here ya go! Honestly the reason we haven't been able to give a quick synopsis of these is because there are simply so many differences. I hope these can help.

__________________
TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth